CLK/Machines/Atari2600/Bus.hpp

//
//  Bus.h
//  Clock Signal
//
//  Created by Thomas Harte on 18/03/2017.
//  Copyright © 2017 Thomas Harte. All rights reserved.
//

#ifndef Atari2600_Bus_hpp
#define Atari2600_Bus_hpp

#include "Atari2600.hpp"
#include "PIA.hpp"
#include "TIA.hpp"
#include "TIASound.hpp"

#include "../../ClockReceiver/ClockReceiver.hpp"
#include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"

namespace Atari2600 {

class Bus {
	public:
		Bus() :
			tia_sound_(audio_queue_),
			speaker_(tia_sound_),
			tia_input_value_{0xff, 0xff},
			cycles_since_speaker_update_(0) {}

		virtual void run_for(const Cycles cycles) = 0;
		virtual void set_reset_line(bool state) = 0;

		// the RIOT, TIA and speaker
		PIA mos6532_;
		std::shared_ptr<TIA> tia_;

		Concurrency::DeferringAsyncTaskQueue audio_queue_;
		TIASound tia_sound_;
		Outputs::Speaker::LowpassSpeaker<TIASound> speaker_;

		// joystick state
		uint8_t tia_input_value_[2];

	protected:
		// speaker backlog accumlation counter
		Cycles cycles_since_speaker_update_;
		inline void update_audio() {
			speaker_.run_for(audio_queue_, cycles_since_speaker_update_.divide(Cycles(CPUTicksPerAudioTick * 3)));
		}

		// video backlog accumulation counter
		Cycles cycles_since_video_update_;
		inline void update_video() {
			tia_->run_for(cycles_since_video_update_.flush());
		}

		// RIOT backlog accumulation counter
		Cycles cycles_since_6532_update_;
		inline void update_6532() {
			mos6532_.run_for(cycles_since_6532_update_.flush());
		}
};

}

#endif /* Atari2600_Bus_hpp */